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つけてた

was turning on, had turned on, was putting on, had applied

→ つける
つけ turn on + て Te-form (conjunctive) + た Past tense
verb · imperfect Rare #30,365
was turning on, had turned on Colloquial contraction of つけていた. Commonly used for turning on a light, appliance, or other device.
JA: 電気をつけてたけど、消して出かけた。
EN: I had turned on the light, but I turned it off before going out.
was putting on, had applied Colloquial contraction of つけていた; used for things such as perfume, makeup, or accessories.
JA: 出かける前に香水をつけてた。
EN: I had applied perfume before going out.
Conjugation of つける
Imperfect
つけてた

同じ香水をつけてたよ

You were wearing the same perfume.

— エブリシング・エブリウェア・オール・アット・ワンス (2022)

つけてたのか？

Did you have it on?

— オープン・ユア・アイズ (1997)

ヘルメットは、つけてたの？

Were you wearing a helmet?

私のあとをつけてたの？

Were you following me?

メアリーは、彼女が一番好きなネックレスをつけてたよ。

Mary was wearing her favorite necklace.

メアリーはお気に入りのネックレスを身につけてたんだ。

Mary was wearing her favorite necklace.